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Spring Integration - basics

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Enterprise companies have many software applications developed in different languages and run on different platforms. These applications need to communicate. Even the big ERP systems can not live alone and should be integrated with other systems.

Application integration needs to provide efficient, reliable and secure data exchange between multiple enterprise applications in order to support common business processes and data sharing.

EAI Suite – suites that encompass messaging, business process automation, workflow, portals, and other functions. Key players in this marketplace are IBM WebSphere MQ, Microsoft BizTalk,TIBCO, WebMethods, SeeBeyond, Vitria, CrossWorlds, and others. Many of these products include JMS as one of the many client API’s they support.

What are Enterprise Integration Patterns ?

A collection of design patterns for use in enterprise application integration and message-oriented middleware

Understanding the patterns allows you to:

build effective messaging systems

develop applications that provide the ability to integrate with another systems in a cleaner manner using messaging

gain insight on how to integrate completely different applications using messaging

There are seven categories of enterprise integration patterns (organized in a catalogue):

Messaging Systems

Messaging Channels

Message Construction

Message Routing

Message Transformation

Messaging Endpoints

System Management

An open-source framework for Enterprise Application Integration

Builds on top of the Spring framework

Supports message-driven architectures where IoC (inversion of control) applies to runtime concerns (the messaging and integration concerns are handled by the framework, so business components are further isolated from the infrastructure and developers are relieved of complex integration responsibilities)

4 different applications should be integrated:

- 3 clothing manufactures – Adidas, Reebok and Nike

- 1 reseller that buys from them

direct communication using application-layer sockets

enforces high coupling between applications

communication using shared files

can lack timeliness

may not enforce data format sufficiently

communication using a shared database

can lack timeliness

the database can turn into a performance bottleneck

communication using RPC

although reduced - coupling is still an issue

messaging – delegates communication details to the messaging system

EIP in Spring Integration

Use case: reseller wants to buy from Nike (they are aware of the messaging system)

EIP in Spring Integration

Messaging Systems

Message

Message Channel

EIP in Spring Integration

Messaging Channels

Point-to-Point Channel

EIP in Spring Integration

Message Construction

Command Message

EIP in Spring Integration

DEMO – Simple Channel

EIP in Spring Integration

Use case: reseller wants to buy from Nike (reseller is aware of the messaging system and Nike is not)

EIP in Spring Integration

Messaging Systems

Message Endpoint

EIP in Spring Integration

Messaging Endpoints

Service Activator

EIP in Spring Integration

DEMO – Service Activator

EIP in Spring Integration

Use case: reseller wants to buy from Nike (both Nike and the reseller and not aware of the messaging system)

EIP in Spring Integration

Messaging Endpoints

Messaging Gateway

EIP in Spring Integration

Message Construction

Request-Reply

EIP in Spring Integration

DEMO – Messaging Gateway

EIP in Spring Integration

Use case: reseller wants to buy from Nike using JMS (both reseller and Nike are not aware of the messaging system)

EIP in Spring Integration

Messaging Channel

Channel Adapter

EIP in Spring Integration

DEMO – Channel Adapter

EIP in Spring Integration

Use case: reseller wants to buy from Nike and Nike requires authentication from the reseller

EIP in Spring Integration

Messaging Systems

Pipes and Filters

EIP in Spring Integration

Messaging Routing

Filter

Content Filter

EIP in Spring Integration

DEMO – Pipes and Filters

EIP in Spring Integration

Use case: reseller wants to buy from Nike and Nike wants to send a notification on order receipt